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Ethylene production in ppm for combinatorial libraries consisting of molybdenum-vanadium-niobium oxides. Ethylene production at 400°C for libraries of (a) 50–100% molybdenum and 0–50% vanadium and niobium in 5% increments, and (b) 55–85% molybdenum, 15–45% vanadium, and 0–30% niobium in 3% increments. Two identical triangular arrays exist on each wafer, differentiated by a C2 rotation operation.
